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Zn + NO3- -> Zn2+ + NH4+
0.....5.-2..........2.......-3.1
Zn naik 2....x2
N turun 8....x1
samakan muatan:
4Zn + NO3- -> 4Zn2+ + NH4+
..0...........-1.............+8.............+1
.....-1 +10H+................................+9
samakan H:
4Zn + NO3- + 10H+ -> 4Zn2+ +NH4+ + 3H2O --> sudah setara
Perbandingan Zn dengan NH4+ yaitu 4 : 1